How is this different from the dictatorship of the bourgeoisie?
It is not. I assume the author just doesn't have the theoretical marxist background to correctly identify it as such.
But tbh, all "liberal democracies" are dictatorships of the bourgeoisie, so a democracy among and for the capitalists, and a dictatorship for the workers.
The problem with the United States is that there are too many billionaires with an outsized influence on the government. They need to fix that.